The drama revolves around the theme of exorcism, telling the story of a chase between a wizard, a priest, and a police officer who use extraordinary powers to combat criminal forces. Kim Jae-wook will play the role of the priest Choi Yoon, who assists the summoner; he has little emotion and always appears very indifferent, with a calm personality like water, he is a character that seems 'lacking in humanity'. Kim Dong-wook will portray the medium Yoon Hwa-pyo, who can see evil spirits; having lost his mother and grandmother due to possession by an evil spirit, he possesses a special ability that ordinary people cannot feel, making him the most psychically powerful among the three main characters. Jeong Chae-eun will play the role of the skeptical police officer Kang Gil-young, who initially does not believe in the existence of evil spirits or exorcisms. However, after pursuing a series of criminals alongside Yoon Hwa-pyo and Choi Yoon, she gradually begins to recognize their existence and confronts the truth of what happened to her in the past.